Datasheet

LT1568
13
1568f
Table 2. Resistor Values in Ohms, Dual 2nd Order Lowpass
Chebyshev, ±0.25dB Passband Ripple, Gain = 1, R11 = R12,
R21 = R22, R31 = R32
f
CUTOFF
(MHz) R11, R21 R31
1 976Ω 825Ω
2 475Ω 412Ω
3 316Ω 274Ω
4 226Ω 205Ω
5 178Ω 165Ω
6 143Ω 137Ω
7 121Ω 118Ω
FREQUENCY (MHz)
0.1
–50
GAIN (dB)
–40
–30
–20
–10
11020
1568 TA09
–60
–70
–80
–90
0
10
Amplitude Response 2nd Order Lowpass Chebyshev,
±0.25dB Passband Ripple, f
CUTOFF
= 1MHz
Transient Response 2nd Order Lowpass Chebyshev,
±0.25dB Passband Ripple, f
CUTOFF
= 1MHz
INPUT
500mV/DIV
OUTPUT
200mV/DIV
1µs/DIV 1568 TA10
DUAL 2nd ORDER LOWPASS FILTER DESIG S
U
Table 3. Resistor Values in Ohms, Dual 2nd Order Lowpass
Bessel, Gain = 1
f
CUTOFF
(MHz) R11, R21 R31
1 866Ω 1180Ω
2 422Ω 590Ω
3 280Ω 383Ω
4 210Ω 287Ω
5 165Ω 232Ω
6 137Ω 191Ω
7 115Ω 162Ω
Amplitude Response
2nd Order Lowpass Bessel, f
CUTOFF
= 1MHz
FREQUENCY (MHz)
0.1
–50
GAIN (dB)
–40
–30
–20
–10
11020
1568 TA11
–60
–70
–80
–90
0
10
Transient Response
2nd Order Lowpass Bessel, f
CUTOFF
= 1MHz
INPUT
500mV/DIV
OUTPUT
200mV/DIV
1µs/DIV
1568 TA12